The Hyakki Gokai is a hyper-stylized, ornate weapon resembling a massive, curved blade with intricate engravings depicting mythical creatures and swirling patterns. Its surface is a mix of polished metal with a dark, almost ethereal glow, and the edge shimmers with a faint, otherworldly light. The handle is wrapped in crimson fabric, secured with golden bands, and ends with a decorative pommel shaped like a demon's head.